The Microchip Technology Inc. 24LC256 is a 32K x 8 (256 Kbit) Serial Electrically Erasable PROM, capable of operation across a broad voltage range

The MCP23017 is a 16-bit, general purpose parallel I/O port expander for I2C bus applications. 

Atmel's itty-bitty ATtiny85 8-Bit Processor. 8K of program space, 6 I/O lines, and 4-channel 10 bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit.

The ATtiny84 is another of Atmel's little tiny 8-Bit Processors. 8K of program space, 12 I/O lines, and 8-channel 10 bit ADC. It will run up to 20MHz with an external crystal and can be programmed in circuit.

The MCP3002 has a 10-bit analog to digital converter (ADC) with a simple to use SPI interface. Use this IC if your microcontroller does not have an ADC or have enough ADC lines. A great chip when you need to add additional ADC lines.

The MCP2551 is a high-speed CAN, fault-tolerant device that serves as the interface between a CAN protocol controller and the physical bus. The MCP2551 device provides differential transmit and receive capability for the CAN protocol controller, and is fully compatible with the ISO-11898 standard, including 24V requirements.

The ENC28J60 is a stand-alone Ethernet controller with an industry standard Serial Peripheral Interface (SPI). It is designed to serve as an Ethernet network interface for any controller equipped with SPI.

Atmel's ATMega328P 8-Bit Processor in 28 pin DIP package. It's like the ATmega168, with double the flash space. 32K of program space.

The Microchip Technology Inc. MCP6001/2/4 family of operational amplifiers (op amps) is specifically designed for general-purpose applications.